Method and device for realizing pressure detection of touch panel based on double sensors

Abstract

The invention relates to the technical field of touchpad pressure detection, and discloses a method and device for achieving touchpad pressure detection based on double sensors, and the method comprises the steps: placing two groups of sensors at the two sides of a touchpad, and carrying out the region division of the touchpad; respectively detecting the pressure of the touch panel through two groups of sensors, and adjusting a detection result according to an area where a touch point is located to obtain two groups of pressure sensing data; and comparing the two groups of pressure sensing data, dynamically adjusting the weight of the two groups of pressure sensing data according to a comparison result, and obtaining a final pressure detection result. The method can combine the detection results of the double sensors for comprehensive judgment, improves the accuracy of the detection results, simultaneously detects each area of the touch panel through the double sensors, dynamically adjusts the weights of the two groups of pressure sensing data through a comparative analysis mode, achieves the higher pressure detection accuracy, and improves the detection accuracy. And the two groups of sensors are more beneficial to use and arrangement on equipment.

Description

Technical Field

[0001] The present application relates to the technical field of touch panel pressure detection, and in particular to a method and device for implementing touch panel pressure detection based on dual sensors. Background Art

[0002] Touchpads are important input devices for many electronic devices. Position information can be obtained through fingers or touchpad accessories. As the functional requirements of electronic devices diversify, more diverse functions can be achieved by obtaining pressure information during the pressing process through touchpads. For example, for digital painting tablets, real-time detection of brush pressure can effectively control brush strokes and achieve better simulation effects.

[0003] Existing touchpad pressure detection is implemented in a variety of ways, such as through conductive silicone deformation detection. Conductive silicone and electrodes are set inside the touchpad. When the user presses, the silicone deforms, causing the contact area with the electrode to change. The contact area is inversely proportional to the resistance value. The pressure value is deduced by measuring the resistance change, and the touch feedback instruction is generated by combining the data conversion model to obtain pressure detection data; or through piezoelectric sensors, using the principle that certain crystal materials will generate internal charges when subjected to mechanical pressure, and then the pressure is judged by the voltage.

[0004] When existing touchpads use piezoelectric sensors to detect touch pressure, the setting of a single piezoelectric sensor will cause errors in the detection data due to the distance between the contact point and the sensor. If too many sensors are used, on the one hand, the cost of touchpad layout will increase, and on the other hand, its structural layout will be affected. Therefore, how to improve the accuracy of touchpad pressure detection by using fewer piezoelectric sensors is the fundamental problem to be solved by the present invention. Summary of the Invention

[0005] In order to improve the accuracy of pressure detection of a touch panel by using fewer piezoelectric sensors, the present application provides a method and apparatus for implementing pressure detection of a touch panel based on dual sensors.

[0006] In a first aspect, the present application provides a method for realizing touch panel pressure detection based on dual sensors, which adopts the following technical solution: A method for implementing touch panel pressure detection based on dual sensors, the method comprising: Two sets of sensors are placed on both sides of the touchpad to divide the touchpad into areas; The touch panel pressure is detected by two sets of sensors respectively, and the detection results are adjusted according to the area where the touch point is located to obtain two sets of pressure sensing data; The two sets of pressure sensing data are compared, and the weights of the two sets of pressure sensing data are dynamically adjusted according to the comparison results to obtain the final pressure detection result.

[0007] By adopting the above technical solution, it is possible to make a comprehensive judgment based on the detection results of the dual sensors to improve the accuracy of the detection results. Compared with the method of using multiple groups of sensors to detect corresponding areas separately, the dual sensors simultaneously detect various areas of the touch panel, and dynamically adjust the weights of the two groups of pressure sensing data through comparison and analysis. While achieving higher pressure detection accuracy, the two groups of sensors are more conducive to their use and layout on the device; the process of adjusting the detection results according to the area where the touch point is located is to obtain adjustment values ​​for different areas based on the accuracy of the pressure detection results tested in different areas during the area division process, and adjust the detection results according to the adjustment values. The pressure sensing data obtained can better reflect the real pressure data during the actual use of the touch panel, thereby improving the accuracy of the final result.

[0008] Optionally, the process of comparing the two sets of pressure sensing data includes: Obtain the real-time pressure difference between the two sets of pressure sensor data and compare the real-time pressure difference with the preset pressure threshold range [F1, F2]: If the real-time pressure difference is less than F1, the two sets of pressure sensor data are adjusted according to a 1:1 weight ratio to obtain the final pressure detection result; If the real-time pressure difference ∈ [F1, F2], the two sets of pressure sensor data are adjusted according to the distance between the touch area and the two sets of pressure sensor data. The weight ratio of the first pressure sensor to the second pressure sensor is , is the distance between the contact area and the first pressure sensor, is the distance between the touch point area and the second pressure sensor, and f is the lookup table function; If the real-time pressure difference is greater than F2, the anomaly detection strategy is executed.

[0009] By adopting the above technical solution and adjusting the weight ratio, the two sets of pressure sensing data can be adaptively adjusted, thereby reducing the impact of the error between the two sets of pressure sensing data on the final detection results and improving the accuracy of pressure detection. When abnormal data exists in the two sets of pressure sensing data, the abnormality is judged by executing the abnormality detection strategy, and the abnormal pressure sensing data is determined, thereby obtaining an accurate final detection result.

[0010] Optionally, the anomaly detection strategy includes: Get the voltage change curve of each group of sensors and select the time window T to get the voltage peak value within the time window T of each group of sensors And the energy accumulation value E, where , is the sampling interval, N is the number of sampling intervals, and , j is a positive integer and j∈[1,N], is the voltage mean value of the jth sampling interval; The voltage peaks of the two sets of sensors Compare with the preset voltage threshold V1, and compare the energy accumulated value E of the two groups of sensors with the preset energy threshold E1: If one of the sensor groups Or when E>E1 or more of the above, the weight of the pressure sensing data corresponding to the group of sensors is adjusted to zero; If both sets of sensors appear Or when one or more of the following situations occur: E>E1, the touchpad function is suspended and a reminder is given; If both sets of sensors satisfy When E≤E1, the comprehensive voltage peak The voltage is compared with the preset voltage threshold V1.

[0011] By adopting the above technical solution, the voltage peak detection result is used to determine whether the signal glitches are caused by high-frequency vibration or electromagnetic interference, and the cumulative energy value is used to judge the cumulative status of the pressure in the time window. Through the comparison process, the influence of the abnormal detection result on the final pressure detection result is eliminated. The two groups of pressure detection results are adjusted by the adjusted weights, and the final detection result obtained can better reflect the actual force state of the touchpad.

[0012] Optionally, when both sets of sensors satisfy When E≤E1, the comprehensive voltage peak The process of judging the preset voltage threshold V1 includes: By formula Calculate the state coefficient , the mean value of the state coefficient based on valid historical data ; The two sets of sensors The weight of the pressure sensing data corresponding to the maximum value is adjusted to zero to obtain the final pressure detection result.

[0013] By adopting the above technical solution, both sets of sensors can meet the When E≤E1, the weight adjustment process and the abnormal feedback process are realized, and the two sets of pressure detection results are adjusted by the adjusted weights, so that the final detection results obtained can better reflect the actual force state of the touch panel.

[0014] Optionally, the method further includes: Perform an overall analysis based on the historical pressure sensing data before the current time point, judge the sensor operation stability based on the overall analysis results, and adjust the next detection process based on the judgment results.

[0015] By adopting the above technical solution, the stability of the sensor is analyzed through historical pressure sensing data, its operating status is judged, and then the performance of the sensor is judged.

[0016] Optionally, the process of judging the operating stability of the sensor based on the overall analysis result includes: Obtain the real-time pressure difference p from several sets of historical continuous data, calculate the pressure difference standard deviation s of several sets of real-time pressure difference p, and compare the pressure difference standard deviation s with the preset threshold value st: If s≤st, the sensor is judged to be operating normally and no adjustment is made to the next detection process; If s>st, the sensor operation stability is judged to be abnormal, and the next detection process is adjusted according to the judgment result.

[0017] By adopting the above technical solution, the operating stability of the sensor is judged by comparing the standard deviation s of the real-time pressure difference in several sets of historical continuous data with the preset threshold value st. At the same time, when it is judged that the operating stability of the sensor is abnormal, the next detection process is adjusted according to the judgment result, so that the sensor abnormality can be judged in time to ensure the accuracy of the final detection result.

[0018] Optionally, when s>st, the process of adjusting the next detection process includes: Adjust the lower limit value F2 of the preset pressure threshold range to ,in, It is the adjustment amount reference table function.

[0019] By adopting the above technical solution, when there are unstable factors in the pressure detection process, the triggering conditions of the abnormality detection strategy are reduced by adjusting the F2 value, that is, timely abnormality detection is achieved when the sensor is operating unstably, ensuring the accuracy of the final detection result.

[0020] In a second aspect, the present application provides a device for implementing touch panel pressure detection based on dual sensors, which adopts the following technical solution: A device for implementing touch panel pressure detection based on dual sensors, wherein the device is used to execute any one of the methods for implementing touch panel pressure detection based on dual sensors as described above.

[0021] By adopting the above technical solution, it is possible to make a comprehensive judgment based on the detection results of the dual sensors to improve the accuracy of the detection results. Compared with the method of using multiple groups of sensors to detect corresponding areas separately, the dual sensors simultaneously detect various areas of the touch panel, and dynamically adjust the weights of the two groups of pressure sensing data through comparison and analysis. While achieving higher pressure detection accuracy, the two groups of sensors are more conducive to their use and layout on the device; the process of adjusting the detection results according to the area where the touch point is located is to obtain adjustment values ​​for different areas based on the accuracy of the pressure detection results tested in different areas during the area division process, and adjust the detection results according to the adjustment values. The pressure sensing data obtained can better reflect the real pressure data during the actual use of the touch panel, thereby improving the accuracy of the final result.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The present invention can combine the detection results of dual sensors for comprehensive judgment and improve the accuracy of the detection results. Compared with the method of detecting corresponding areas separately by multiple groups of sensors, dual sensors are used to detect various areas of the touch panel simultaneously. Through comparison and analysis, the weights of the two groups of pressure sensing data are dynamically adjusted. While achieving higher pressure detection accuracy, the two groups of sensors are more conducive to their use and deployment on the device. The process of adjusting the detection results according to the area where the touch point is located is to obtain adjustment values ​​for different areas based on the accuracy of the pressure detection results tested in different areas during the area division process. The detection results are adjusted according to the adjustment values, so that the pressure sensing data obtained can better reflect the actual pressure data during the actual use of the touch panel, thereby improving the accuracy of the final result.

[0023] 2. The present invention can adaptively adjust the two sets of pressure sensing data by adjusting the weight ratio, reduce the impact of the error between the two sets of pressure sensing data on the final detection results, and improve the accuracy of pressure detection; when there is abnormal data in the two sets of pressure sensing data, the abnormality is judged by executing the abnormality detection strategy, and the abnormal pressure sensing data is determined, thereby obtaining an accurate final detection result.

[0024] 3. When there are unstable factors in the pressure detection process, the present invention reduces the triggering conditions of the abnormality detection strategy by adjusting the F2 value, that is, it realizes timely abnormality detection when the sensor is unstable, ensuring the accuracy of the final detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a flowchart of the steps of implementing a touch panel pressure detection method based on dual sensors; Figure 2 is a diagram showing the arrangement of sensors in one embodiment; Figure 3 is a diagram showing the arrangement of sensors in another embodiment; Figure 4 FIG. 1 is a schematic diagram of the overall structure of a touch panel in an embodiment. DETAILED DESCRIPTION

[0026] Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings.

[0027] Throughout this specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0028] The present application discloses a method for realizing touch panel pressure detection based on dual sensors. Figure 1 The method includes: placing two sets of sensors on both sides of the touch panel to divide the touch panel into areas; detecting the pressure of the touch panel using the two sets of sensors respectively, and adjusting the detection results according to the area where the touch point is located to obtain two sets of pressure sensing data; comparing the two sets of pressure sensing data, dynamically adjusting the weights of the two sets of pressure sensing data according to the comparison results, and obtaining the final pressure detection result. In this embodiment, by adopting a dual sensor method and placing it on both sides of the touch panel, referring to Figure 2 , the sensor position can be set to the upper and lower sides, refer to Figure 3 , the sensor can be set at the left and right diagonal positions, refer to Figure 4The touchpad comprises a touch panel, a silicone pad, a PCB, a structural steel sheet, a mounting base, and mounting screws. Pressing the touch panel on the surface of the touchpad pushes down six metal springs through the silicone pad, causing the bases of the springs to deform. Two sets of sensors detect the deformation of the springs and calculate the pressure based on the position of the finger pressing. Compared to using a single sensor to detect touchpad pressure, the dual sensors can combine the results of both sensors for comprehensive judgment, thereby improving the accuracy of the detection results. Furthermore, compared to a method where multiple sets of sensors detect corresponding areas separately, the detection method of this embodiment uses dual sensors to simultaneously detect various areas of the touchpad. Through comparison and analysis, the weights of the two sets of pressure sensing data are dynamically adjusted, achieving higher pressure detection accuracy. The two sets of sensors are also more convenient for use and deployment on the device. In addition, in the above solution, the process of adjusting the detection results based on the area where the touch point is located is to obtain adjustment values ​​for different areas based on the accuracy of the pressure detection results tested in different areas during the area division process. The detection results are adjusted based on the adjustment values. The resulting pressure sensing data better reflects the actual pressure data during actual use of the touchpad, thereby improving the accuracy of the final results.

[0029] In one embodiment, the process of comparing two sets of pressure sensor data includes: first, obtaining a real-time pressure difference between the two sets of pressure sensor data. When the real-time pressure difference between the two sets of pressure sensor data is low, it indicates that the detection results of the two sets of sensors are relatively consistent. Conversely, when the real-time pressure difference between the two sets of pressure sensor data is too high, it indicates that there are abnormal detection results in the two sets of sensors. In this embodiment, the real-time pressure difference is compared with a preset pressure threshold interval [F1, F2]. The preset pressure threshold interval [F1, F2] is selected and set based on empirical data. When the real-time pressure difference is less than F1, it indicates that the detection results of the two sets of sensors are consistent. The two sets of pressure sensor data are adjusted according to a 1:1 weight ratio to obtain a more accurate final pressure detection result. When the real-time pressure difference ∈ [F1, F2], it indicates that there is a certain error in the two sets of sensors. In order to improve the accuracy of the final detection result, the two sets of pressure sensor data are adjusted according to the distance between the area where the touch point is located and the two sets of pressure sensor data, and the weight ratio of the first pressure sensor to the second pressure sensor is adjusted to ,in is the distance between the contact area and the first pressure sensor, is the distance between the area where the touch point is located and the second pressure sensor, f is the reference table function, and the reference table function f sets the corresponding weight value according to the accuracy data within different distance ranges from the sensor, and the closer the distance, the higher the corresponding weight value. Therefore, through the adjusted weight ratio, the two sets of pressure sensing data can be adaptively adjusted to reduce the impact of the error between the two sets of pressure sensing data on the final detection result, thereby improving the accuracy of pressure detection; in addition, when the real-time pressure difference is greater than F2, it indicates that there is abnormal data in the two sets of pressure sensing data. Therefore, by executing the abnormal detection strategy, the existence of the abnormality is judged, and the pressure sensing data with abnormality is determined, thereby obtaining an accurate final detection result.

[0030] In one embodiment, the abnormality detection strategy includes: obtaining the voltage change curve of each group of sensors and selecting a time window T. In this embodiment, T=50ms, obtaining the voltage peak value within the time window T of each group of sensors And the energy accumulation value E, where , is the sampling interval, N is the number of sampling intervals, and , j is a positive integer and j∈[1,N], is the voltage mean value of the jth sampling interval. Since the abnormal detection result of the piezoelectric sensor is mainly caused by interference, this embodiment obtains the voltage peak value within the time window T of each group of sensors. And the energy accumulation value E, through the voltage peak The detection result is whether the signal burr is caused by high-frequency vibration or electromagnetic interference. The pressure accumulation status in the time window is judged by the energy accumulation value E, and the voltage peak value of the two sets of sensors is then calculated. Compare with the preset voltage threshold V1, and compare the energy accumulated value E of the two groups of sensors with the preset energy threshold E1: If one of the groups of sensors has Or E>E1 or more of the following situations, the weight of the pressure sensing data corresponding to the group of sensors is adjusted to zero, that is, another group of pressure sensing data is selected as the final result, eliminating the influence of abnormal detection results on the final pressure detection results; if both groups of sensors have Or E>E1 or more of the following situations, it means that both sets of sensor data are abnormal, indicating that the device has a hardware failure risk, so the touchpad function is suspended and a reminder is issued; if both sets of sensors meet the When E≤E1, the comprehensive voltage peak The specific process includes: judging by the preset voltage threshold V1: Calculate the state coefficient When the sensor is disturbed, its voltage peak is prone to large fluctuations, so the state coefficient is obtained by the ratio of its voltage peak to the energy accumulation value E. , when the state coefficient When the data is larger than the historical mean, the risk of abnormality in the corresponding result is also greater. Therefore, the mean value of the state coefficient obtained based on valid historical data is , the two sets of sensors The weight of the pressure sensor data corresponding to the maximum value is adjusted to zero, and the weight of the pressure sensor data corresponding to the maximum value is adjusted to zero. The pressure sensing data corresponding to the minimum value is taken as the final pressure detection result. Through the above process, the pressure sensing data corresponding to the minimum value can be used as the final pressure detection result. When E≤E1, the weight adjustment process and the abnormal feedback process are realized, and the two sets of pressure detection results are adjusted by the adjusted weights, so that the final detection results obtained can better reflect the actual force state of the touch panel.

[0031] In one embodiment, the method further includes: performing an overall analysis based on historical pressure sensing data before the current time point, judging the operating stability of the sensor based on the overall analysis result, and adjusting the next detection process based on the judgment result. When the sensor is in a stable operating state, the real-time pressure difference between the two sets of pressure sensing data is low and remains stable. Therefore, the stability of the sensor is analyzed through historical pressure sensing data to judge its operating state, thereby realizing the judgment of the sensor performance.

[0032] Among them, the process of judging the operating stability of the sensor according to the overall analysis result includes: obtaining real-time pressure difference p in several groups of historical continuous data, calculating the pressure difference standard deviation s of several groups of real-time pressure difference p, and comparing the pressure difference standard deviation s with the preset threshold value st. The preset threshold value st is set according to the fitting of empirical data. If s≤st, it means that the data error between the two groups of sensors is relatively stable, so the sensor operating stability is judged to be normal, and no adjustment is made to the next detection process; if s>st, it means that the data of the two groups of sensors have a large fluctuation, so the sensor operating stability is judged to be abnormal, and the next detection process is adjusted according to the judgment result. Among them, the process of adjusting the next detection process includes: adjusting the lower limit value F2 of the preset pressure threshold interval to ,in, It is an adjustment amount comparison table function, which determines the corresponding adjustment amount according to the test data and different ranges of s-st. Therefore, when there are unstable factors in the pressure detection process, the triggering conditions of the abnormality detection strategy are reduced by adjusting the F2 value. That is, when the sensor is unstable, timely abnormality detection is achieved, ensuring the accuracy of the final test results.

[0033] The present application also discloses an apparatus for implementing touchpad pressure detection based on dual sensors, which is used to execute any of the methods for implementing touchpad pressure detection based on dual sensors as described above. This embodiment uses a dual sensor approach. Compared to using a single sensor to detect touchpad pressure, the dual sensor can combine the results of both sensors for comprehensive judgment, thereby improving the accuracy of the detection results. Furthermore, compared to using multiple sets of sensors to detect corresponding areas separately, the dual sensor simultaneously detects and compares each area of ​​the touchpad, dynamically adjusting the weights of the two sets of pressure sensing data. This achieves higher pressure detection accuracy, while also making the two sets of sensors more convenient for use and deployment on the device. The pressure sensing data obtained can better reflect the actual pressure data during actual use of the touchpad, thereby improving the accuracy of the final result.

[0034] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for realizing touch panel pressure detection based on dual sensors, characterized in that: The method comprises: Two sets of sensors are placed on both sides of the touchpad to divide the touchpad into areas; The touch panel pressure is detected by two sets of sensors respectively, and the detection results are adjusted according to the area where the touch point is located to obtain two sets of pressure sensing data; The two sets of pressure sensing data are compared, and the weights of the two sets of pressure sensing data are dynamically adjusted according to the comparison results to obtain the final pressure detection result.

2. The method for realizing touch panel pressure detection based on dual sensors according to claim 1, characterized in that: The process of comparing two sets of pressure sensor data includes: Obtain the real-time pressure difference between the two sets of pressure sensor data and compare the real-time pressure difference with the preset pressure threshold range [F1, F2]: If the real-time pressure difference is less than F1, the two sets of pressure sensor data are adjusted according to a 1:1 weight ratio to obtain the final pressure detection result; If the real-time pressure difference ∈ [F1, F2], the two sets of pressure sensor data are adjusted according to the distance between the touch area and the two sets of pressure sensor data. The weight ratio of the first pressure sensor to the second pressure sensor is , is the distance between the contact area and the first pressure sensor, is the distance between the touch point area and the second pressure sensor, and f is the lookup table function; If the real-time pressure difference is greater than F2, the anomaly detection strategy is executed.

3. The method for realizing touch panel pressure detection based on dual sensors according to claim 2, characterized in that: The anomaly detection strategy includes: Get the voltage change curve of each group of sensors and select the time window T to get the voltage peak value within the time window T of each group of sensors And the energy accumulation value E, where , is the sampling interval, N is the number of sampling intervals, and , j is a positive integer and j∈[1,N], is the voltage mean value of the jth sampling interval; The voltage peaks of the two sets of sensors Compare with the preset voltage threshold V1, and compare the energy accumulated value E of the two groups of sensors with the preset energy threshold E1: If one of the sensor groups Or when E>E1 or more of the above, the weight of the pressure sensing data corresponding to the group of sensors is adjusted to zero; If both sets of sensors appear Or when one or more of the following situations occur: E>E1, the touchpad function is suspended and a reminder is given; If both sets of sensors satisfy When E≤E1, the comprehensive voltage peak The voltage is compared with the preset voltage threshold V1.

4. The method for realizing touch panel pressure detection based on dual sensors according to claim 3, characterized in that: When both sets of sensors meet When E≤E1, the comprehensive voltage peak The process of judging the preset voltage threshold V1 includes: By formula Calculate the state coefficient , the mean value of the state coefficient based on valid historical data ; The two sets of sensors The weight of the pressure sensing data corresponding to the maximum value is adjusted to zero to obtain the final pressure detection result.

5. The method for realizing touch panel pressure detection based on dual sensors according to claim 2, characterized in that: The method further comprises: Perform an overall analysis based on the historical pressure sensing data before the current time point, judge the sensor operation stability based on the overall analysis results, and adjust the next detection process based on the judgment results.

6. The method for realizing touch panel pressure detection based on dual sensors according to claim 5, characterized in that: The process of judging the sensor's operational stability based on the overall analysis results includes: Obtain the real-time pressure difference p from several sets of historical continuous data, calculate the pressure difference standard deviation s of several sets of real-time pressure difference p, and compare the pressure difference standard deviation s with the preset threshold value st: If s≤st, the sensor is judged to be operating normally and no adjustment is made to the next detection process; If s>st, the sensor operation stability is judged to be abnormal, and the next detection process is adjusted according to the judgment result.

7. The method for realizing touch panel pressure detection based on dual sensors according to claim 6, characterized in that: When s>st, the process of adjusting the next detection process includes: Adjust the lower limit value F2 of the preset pressure threshold range to ,in, It is the adjustment amount reference table function.

8. A device for realizing touch panel pressure detection based on dual sensors, characterized in that: The device is used to run the method for realizing touch panel pressure detection based on dual sensors as described in any one of claims 1 to 7.

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